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    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 网络延迟时间 -->
    <script>
      var networkDelayTime = function (times, n, k) {
        const arr = new Array(n + 1).fill(-1)
        arr[k] = 0
        for (let i = 0; i < n; i++) {
          for (const [a, b, time] of times) {
            if (arr[a] !== -1) {
              arr[b] = arr[b] === -1 ? arr[a] + time : Math.min(arr[b], arr[a] + time)
            }
          }
        }
        if (arr.lastIndexOf(-1) > 0) {
          return -1
        }
        return Math.max(...arr)
      }
      console.log(
        networkDelayTime(
          [
            [2, 1, 1],
            [2, 3, 1],
            [3, 4, 1]
          ],
          4,
          2
        )
      )
    </script>
  </body>
</html>
